LegoBigPlanet would be really cool... Although LittleBigPlanet is not as interesting to me, I think a Lego version would be great.
Seriously though it will have to be a Warner Brothers film probably since they bought Traveller's Tales. I don't know if they will still do LucasFilm stuff.
Here is a link denying Harry Potter:
http://www.gamefocus.ca/?nav=new&nid=2828